My passenger seat lumbar support is not holding air. The truck is just a year old. How does the switch let the air out of the support? Do they use a solenoid valve or is it incorporated into the switch? Have any of you guys had to work on these? How easy is it to take the seat back apart to check? Still under warranty but I don't want some dealer wizard tearing into it if I can fix it . Any suggestions or help much appreciated!!!! Chris